How do I find a genuine company to do part time work from home?

Just that really, I would like to do some part time/evening work to supplement my income but have heard too many stories about people paying joining fees and then not getting any work etc. I would be happy to anything like stuffing envelopes which can be done from home in the evenings. Not able, to do parties (eg Ann Summers, Avon etc). Can anyone pointe in the direction of a website or company that could help? Have searched Internet for home working but so much rubbish comes up!.Thank you.